One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,5)(7,8)(9,10)(11,15)(12,16)(13,14)(17,18,23,36,22,27,21,26)(19,28,35,24,29,43,31,38)(20,25,37,48,33,41,34,42)(30,44,47,39,32,46,45,40)(10,14)(11,12)(17,19)(18,24)(20,32)(21,35)(22,29)(23,31)(25,40)(26,43)(27,38)(28,36)(30,33)(34,45)(37,47)(39,41)(42,44)(46,48) involution — undirected(2,5)(6,8)(9,11,13,12)(10,15,14,16)(19,29)(20,33)(24,38)(25,41)(28,43)(31,35)(34,37)(42,48)(9,12,13,11)(10,16,14,15)(17,20)(18,25)(19,30)(21,34)(22,33)(23,37)(24,39)(26,42)(27,41)(28,44)(29,32)(31,45)(35,47)(36,48)(38,40)(43,46)(1,3,4,7)(2,6,5,8)(20,33)(25,41)(30,32)(34,37)(39,40)(42,48)(44,46)(45,47)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.